Liquid-Filled Vibration Isolator Radial Precompression
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Solution Overview
Problem
The durability of liquid-filled vibration isolators is compromised due to mold shrinkage-induced deformation of annular elements, leading to uneven radial compressive loads and tensile strain in the elastic body, which reduces the effectiveness of vibration damping.
Innovation Solution
The design includes outer face portions with first and second segments on the elastic body, where the second unit applies a radial compressive load through the first segments, preventing tensile strain and improving durability, and intermediate plates are embedded to enhance the static spring constant, while the second segments are thinner to minimize deformation and maintain the orifice's cross-sectional area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the second unit is drawn to manufacture the liquid-filled vibration isolator, then the liquid chambers are formed and the device is assembled, but the annular elements deform due to mold shrinkage causing uneven radial compressive loads
Solution Approach 1:
The patent applies preliminary action by pre-compressing the elastic body in the radial direction before the drawing process. Compressive prestress is applied to the elastic body (30) in the radial direction prior to inserting the intermediate unit (60) into the second unit (50). This preliminary compression counteracts the mold shrinkage forces that occur during the drawing process, preventing deformation of the annular elements and maintaining dimensional accuracy throughout manufacturing.
2Productivity
If the annular elements are deformed by mold shrinkage, then the manufacturing process completes, but the radial compressive load becomes uneven creating tensile strain in the elastic body
Solution Approach 1:
The patent applies preliminary anti-action by applying compressive prestress to counteract the tensile strain that would otherwise be generated during the drawing process. The compressive prestress is applied in advance to the elastic body in the radial direction, creating a pre-compressed state that resists the tensile forces generated when the second unit is drawn. This prevents the elastic body from experiencing damaging tensile strain while maintaining manufacturing efficiency.
3Ease of operation
If the drawing ratio of annular elements at coupling element connection parts is lower, then the intermediate unit fits into the second unit, but the radial compressive load applied by the second unit becomes small
Solution Approach 1:
The patent applies parameter changes by modifying the stress state parameters of the elastic body through pre-compression. By applying compressive prestress in the radial direction before assembly, the stress distribution parameters are changed to ensure uniform radial compressive load after assembly. This allows the intermediate unit to fit properly into the second unit while maintaining adequate radial compressive load on the elastic body for effective vibration isolation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the durability of the liquid-filled vibration isolator by distributing compressive loads effectively, reducing tensile strain, and maintaining the dynamic spring constant and damping coefficient within designed values, thereby improving ride comfort and stability.
Implementation Method 1
a liquid-filled vibration isolator that dampens vibrations by means of a resonance phenomenon of liquid
Implementation Method 2
bonded by vulcanization to the shaft unit and the first unit
Data Source
AI summary
The present invention provides a liquid-filled vibration isolator with improved durability. The liquid-filled vibration isolator includes a shaft unit, a first unit, an elastic body coupling the first unit and shaft unit, and a second unit mounted radially outside the first unit. The first unit includes a pair of annular elements, a pair of coupling elements coupling the annular elements, while the elastic body includes outer face portions bonded to outer surfaces of the coupling elements. The outer face portions include lips making contact with the second unit, and first segments making contact with the second unit on areas larger than the lips. The second unit restrains the annular elements along the entire circumferences, and compresses the lips and first segments in the radial direction.